It is made up of a ____ surrounded by a ____. At the top is a contact for the RTL, and at the bottom a ____ for screwing into the ____. On the metal casing is a small arm that extends over the ____ electrode, and it is in the gap between these two points that a ____ is created. ____ flows down the central electrode and in ____ the gap makes a spark to fire the mixture in the cylinder.

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